[Feature request] Add a wrapper for Properties

[massimosiani]

Hi! Thinking about adding a wrapper for system props, similar to what Env is for env vars.
I came up with

trait Prop[F[_]] {
  def get(name: String): F[Option[String]]
  def modify(name: String, f: String => (String, String)): F[Option[String]]
  def set(name: String, value: String): F[Unit]
  def update(name: String, f: String => String): F[Unit]
}

(don't really like the name).

I can provide a PR if it sounds useful.

[bpholt]

I could have used this today. It seems like a helpful addition.

[iRevive]

Same. I have several use cases where Prop would be helpful.